Teaching Principal Component Analysis Using a Free and Open Source Software Program and Exercises Applying PCA to Real-World Examples

Autor/inn/en	Sidou, Lais Feltrin; Borges, Endler Marcel
Titel	Teaching Principal Component Analysis Using a Free and Open Source Software Program and Exercises Applying PCA to Real-World Examples
Quelle	In: Journal of Chemical Education, 97 (2020) 6, S.1666-1676 (11 Seiten)Infoseite zur Zeitschrift PDF als Volltext Verfügbarkeit
Zusatzinformation	ORCID (Borges, Endler Marcel)
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	0021-9584
Schlagwörter	Factor Analysis; Chemistry; Science Instruction; Teaching Methods; Computer Software; Correlation; Models; Diabetes; Patients; Biochemistry; Animals; Classification; Food; Comparative Analysis; Computer Assisted Instruction; Undergraduate Students; Open Source Technology; Interdisciplinary Approach + Suchen Sie Ihr Suchwort? Faktorenanalyse; Chemie; Teaching of science; Science education; Natural sciences Lessons; Naturwissenschaftlicher Unterricht; Teaching method; Lehrmethode; Unterrichtsmethode; Korrelation; Analogiemodell; Patient; Biochemie; Animal; Tier; Tiere; Classification system; Klassifikation; Klassifikationssystem; Lebensmittel; Computer based training; Computerunterstützter Unterricht; Fächerübergreifender Unterricht; Fächerverbindender Unterricht; Interdisziplinarität
Abstract	Principal component analysis (PCA) is one of the most important and powerful methods in chemometrics as well as in a wealth of other areas. Running a PCA results in two main elements, the score plot and the loading plot; the score plot provides the location of the samples, and the loading plot indicates correlations among variables, the trends in the grouping of samples, and the most important variables. In the past 10 years teaching chemometrics, we have struggled with not having free software with an easy to use graphical user interface for data handling and calculations. In this paper, we provide a series of examples that students used to carry PCA in R-Project, a free and open source software program. In the first example, students used PCA to find correlations among chemical properties of chemical elements and relate these properties with the periodic distribution of the elements. In the second example, meat samples were grouped using 14 variables, and students could observe how outlier samples might influence the PCA model; in this case, they were also taught how to use the t test to choose the variables that were significant to the PCA model. In the third example, healthy patients were differentiated from diabetic patients using 163 lipid concentrations. In the fourth example, Atlantic salmon samples were differentiated from catfish samples. In the fifth and sixth examples, students were able to observe how data treatment affects the classification of natural products and edible oils, respectively. (As Provided).
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Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2024/1/01